ZnO纳米陶瓷的I-V特性

采用连续成型工艺压制纳米ZnO素坯,常压烧结制备了高密度纳米ZnO陶瓷。场发射扫描电镜显示,纳米ZnO陶瓷体微观组织紧密、晶粒尺寸和密度分布均匀。在小电流区测定了纳米ZnO陶瓷的I-V曲线。结果表明,高密度纳米ZnO陶瓷具有良好的非线性伏安特性,其非线性系数高于传统的ZnO陶瓷。     

用贝壳制备醋酸钙

本文介绍了用贝壳制备醋酸钙的反应原理、实验方法，并对醋酸的用量、浓度及条件进行了探讨。     

锂离子电池碳负极材料研究进展

综述锂离子电池碳负极材料的研究进展,主要包括中间相碳微球、天然石墨、无定形碳负极材料以及天然石墨表面改性.对天然石墨表面改性是改善锂离子电池负极材料性能的重要手段,通过改性处理,可有效降低石墨电极的不可逆容量,从而使可逆容最和库仑效率有较大程度的提高.由于表面改性天然石墨具有成本和性能方面的综合优势,是今后较长一段时间内,工业化应用的锂离子电池主要负极材料.     

Preparation of nanometer oxides La1−xSrxMnO3 by absolute alcohol as solvent

Nanometer oxides La1-xSrxMnO3 were synthesized by absolute alcohol as solvent. The desired metal cations were chelated in a solution using citric acid as the chelating agents. In order to get the optimum preparation condition for Lal-xSrxMnO3, the pH of primal commix solution, the molar fraction of citric acid and baking temperature of predecessor block were researched by orthogonal test design method with different x. The thermal decomposition of the metal carboxylate precursor gels was studied by TG/DTA and the products derived from calcinations of the gels were characterized by XRD and TEM. The polarization curves were acquired on an electrochemical work station （LK98） and the discharge curves were acquired on a testing instrument of batteries （DC-5） with a constant current discharge under 120 mA/cm^2. The results reveal that the nanometer oxides can be achieved by absolute alcohol as solvent and it has better catalytic activity.     

热变形量对低铬半钢组织与力学性能的影响

通过对不同热变形量的低铬半钢的组织与性能进行观察、测试及分析，结果表明：热变形能够显著改善低铬半钢的组织与力学性能。其中，40%-50%热变形量的低铬半钢力学性能最好。     

萘油馏份加工方案的选择

济宁煤化公司为增加工业萘生产加工能力，外购了部分萘油，从而制定了双炉双塔精馏装置强化生产和将现双炉双塔工业萘蒸馏流程改为两套单炉单塔工业塔精馏流程两种方案，并对两方案进行了系统分析，比较．     

一种新的变步长LMS自适应算法及其应用

传统的固定步长的LMS算法难于同时获取较快的收敛速度与较小的稳态误差,基于这一矛盾,本文在分析基本LMS算法的基础上,提出了一种新的变步长LMS算法,该算法具有较快的收敛速度和较小的稳态误差。理论分析和计算机仿真结果表明该算法在收敛速度与稳态误差的性能上均优于基本LMS算法。尤其是在低估噪比的情况下,其性能的优越性更为突出。与传统的LMS算法相比较,新算法更适合于应用到回波消除等实时性要求高的场合。